Coupling



FIG. 1 is an isometric view of an embodiment of my design for a coupling;

FIG. 2 is a front view of the design of the coupling shown in FIG. 1;

FIG. 3 is a rear view of the design of the coupling shown in FIG. 1;

FIG. 4 is a left side view of the design of the coupling shown in FIG. 1;

FIG. 5 is a right side view of the design of the coupling shown in FIG. 1;

FIG. 6 is a bottom view of the design of the coupling shown in FIG. 1; and,

FIG. 7 is a top view of the design of the coupling shown in FIG. 1.

The broken lines depict portions of the coupling that form no part of the claimed design. 

CLAIM We claim the ornamental design for a coupling, as shown and described. 